I apprecaite you letting us know the data is not important. The next steps I am suggesting should only be tried on a system that either has a valid backup or there is no data of value.
You do not need to have the FC cables connected. They are of no importance for regaining user access and I suggest leaving them removed for now.
One of the screenshots you provided shows you attempted to login but the password was incorrect.
Cheers,
Shawn